Roofing structure



April 4, 1939. J. KAHN ET AL ROOFING STRUCTURE Filed Fb. 2, 1937.INVENIOR. Janus Map/m BY W41. me E5 mu RNEY.

atented pr. 4i, l3

ROOFING STRUCTURE Julius Kahn and Walter F. Schulz, Youngstown, Ohio,assignors to Republic Steel Corporation, Cleveland, Ohio, a corporationof New Jersey Application February 2, 1937, Serial No. 123,646

3 Claims. (01. 108-18) This invention relates to sheet metal roofing andsiding and is particularly directed to improvements in the jointconstruction therefor.

An object of this invention is to provide a simple and efficient lapjoint for metal roofing and siding sheets formed in such a manner thatthey may be readily overlapped one .on the other and secured to thedecking of the roof, to form a water tight structure free from leakage.

Another object of this invention is to provide a jointed constructionfor metal roofing and sheathing which embodies metal sheets having aplurality of channels therein formed to possess great strength andstability, the members and parts of the channels being so arrangedas toprevent creepage of water by capillary attraction to the underlyingstructure of the roofing, and at the same time permit free circulationof air through the joints to effect the dissipation of moisture therein.

Other objects and advantageous features more or less ancillary of theforegoing and the manner in which all the various objects are realizedwill appear in the following description which, considered in connectionwith the accompanying drawing, sets forth the preferred embodiment ofthe invention.

Fig. 1 is a perspective view illustrating the sheathing as applied tothe decking of a roof or similar structure.

Fig. 2 is an enlarged sectional view in perspective of the jointconstruction taken on a plane indicated by the line 2-2 of Fig. 1.

Referring to the drawing, Figs. 1 and 2 illustrate a roofing structurecomprising a, plurality.

of metal sheets, generally indicated by the numeral 5, each of thesheets being interchangeable with the other and laid with theirrespective marginal edges in overlapped relation.

The marginal edge of each sheet is formed with a pair of spaced parallelridges or ribs 6 and l, preferably'configured with convergent side wallsand a flat top wall resembling the cross section of a truncated cone.The inclined legs, 8, 9, it and ll of the convergent side Wallsterminate in a top wall or crown l2, parallel to the plane of the bodyof the sheet.

The legs 9 and ill, form a trough or valley l3, intermediate the ribs 6and l, the bottom portion l4 thereof, being disposed in the plane of thebody of the sheet.

The leg H of the rib l is formed with an upturned arcuate flangeconstituting a relatively shallow trough it, which extends throughoutthe length of the sheet in the plane of the body portion thereof.

A rib or flute iii of lesser altitude than the ribs 6 and l is formed inthe sheet adjacent the base of the rib 6 and in spaced relationtherewith, thus forming a trough or gutter ll between the flute l6 andrib 6.

The opposite marginal edge of the sheet is formed with a ridge or ribit, having inclined legs I9 and 20, which terminate in a flat top orcrown 2|. The leg [9 is formed with an upturned arcuate flange whichdefines a shallow trough or gutter 22.

A rib or flute 23 is formed in the sheet adjacent the base of the leg20, and in spaced relation therewith, the structure forming a trough orgutter 24, between the leg 20 and the flute 23. The rib iii, the gutter22, and the flute 23 being constructed to overlie and snugly engage theouter inclined walls of the ribs 6 and I, the gutter I1 and the troughl5, of the adjacent sheet when the roofing or sheathing is laid inassembled relation.

A rib 25 is formed in the sheet intermediate the ribs to strengthen thesheet, as well as enhance the appearance of the roofing.

Grooves 26 may be formed in the crown portions I 2 of the ribs 6 and Iand along each marginal edge of the top portion 2| of the rib l8,through which nails 21 or the like may be easily and readily driven tosecure the sheets upon the roof structure.

In applying the sheets upon a roof or similar structure, the marginaledges are laid in overthe corruga ions 6 and l, and the grooves 22 and24 firmly seated within the troughs l and H. In such construction amultiplicity of barriers is provided which prevents the entry ofmoisture between the sheets, and provides drainage channels for suchwater or condensation as might pass such barriers, further the flutes orribs l6 and 23 are disposed to deflect moisture laden air currentsupwardly and away from the exposed seam of the joint, and will efiect alow pressure area which creates a suction within the gutter 22 tocounteract the capillary action between the over-lapped portions of thesheets.

, The rigidity of the joint structure and insured intimate engagement ofthe overlapping portions of the sheets is attained by the provision ofthe upturned arc'uate flanges and the engagement thereof with thesurfaces of complemental configuration in the contiguous sheets. Theefliciency of the seal is further aided by the rigidity of the portionof the sheet having the ribs 6 and i therein and the overlying portionof the sheet having the rib l8 therein.

In the assemblyof the sheets the inclined side walls l9 and 20 of theuppermost sheet will embrace and be wedged upon the walls 8 and 9 of thesubjacent sheet until the upturned flange on the free end of the lowersheet engages the base of the gutter 24 where deflection of the leg Hwill be arrested and intimate engagement between the inclined legs IIand 20 will be efiected. With the structure embodying the ribs 6 and Ithus rigidly united with the uppermost plate, no lateral movement willbe effected between the overlying sections, and the free end of the legIQ of the uppermost plate will be urged against the inclined wall 8 ofthe underlying plate, the arcuate flanged edge portion abutting. theedge'of the gutter I! increasing the pressure between such surfaces andthus eifecting a fluid-tight seal.

Although the foregoing description is necessarily of a detailedcharacter, in order that the invention may be completely set forth, itis to be understood that the specific terminology is not intended to berestrictive or confining, and that various rearrangements of parts andmodifications of detail may be resorted to without departing from thescope or spirit of the invention as herein claimed.

We claim:

l. A lap joint for roof sheathing. comprising two metal sheetsoverlapping at their marginal edge portions, the overlapping portions ofthe upper sheet having. a raisedcentral part flanked by downwardlydiverging straight legs terminating in short upwardly and outwardlycurved parts, the overlapped portion of the lower sheet having a troughflanked by substantially flat parts merging into downwardly divergingstraight legs terminating in upwardly and outwardly curved parts, thecentral part of the overlapping portion of the upper sheet lying on thesubstantially flat parts of the lower sheet, the downwardly diverginglegs of both sheets being parallel and intimately pressing against eachother, and the upwardly curved parts of the upper sheet nesting in thecorre-.

sponding parts of the lower sheet, and means passing through the centraloverlapping part of the upper sheet and through the lower sheet to holdthem in assembled relation.

2. A lap joint for roof sheathing comprising two metal sheetsoverlapping at their marginal edge portions, the lower sheet having alongitudinally extending enlarged trough flanked by downwardly divergingsubstantially straight legs terminating in upwardly and outwardly curvedportions forming small troughs and the upper sheet having a raisedcentral part spanning the trough of the lower sheet, said upper sheethaving downwardly diverging substantially straight legs which overlieand intimately engage the corresponding legs of the lower sheet, one ofthe legs of the upper sheet terminating in an upwardly and outwardlycurved portion nesting in the marginal curved portion of the lowersheet.

3. A lap joint for roof sheathing comprising two sheets overlapping attheir marginal edges, the overlapped portion of the lower sheet having alarge trough flanked by raised portions merging into downwardlyextending legs, one of said legs terminating in a short upwardly andoutwardly curved portion forming a small gutter, a gutter and a smallrib joining the other of said legs to the body of the lower sheet, theoverlapping portion of the upper sheet having a raised central partcovering the large trough and flanked by downwardly extending legsintimately engaging the legs of the overlapped sheet, a gutter and asmall rib joining one of said legs to the body of said sheet, and theother leg terminating adjacent the second mentioned gutter formed in thelower sheet.

JULIUS KAHN. WALTER F. SCHULZ.

